166944487 has 2 divisors, whose sum is σ = 166944488. Its totient is φ = 166944486.

The previous prime is 166944467. The next prime is 166944521. The reversal of 166944487 is 784449661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166944487 - 2¹¹ = 166942439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166944487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166944467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83472243 + 83472244.

It is an arithmetic number, because the mean of its divisors is an integer number (83472244).

Almost surely, 2^166944487 is an apocalyptic number.

166944487 is a deficient number, since it is larger than the sum of its proper divisors (1).

166944487 is an equidigital number, since it uses as much as digits as its factorization.

166944487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 49.

The square root of 166944487 is about 12920.6999423406. The cubic root of 166944487 is about 550.6268192450.

The spelling of 166944487 in words is "one hundred sixty-six million, nine hundred forty-four thousand, four hundred eighty-seven".